mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-05 08:17:04 +00:00
Extend the FeatureSource interface with new methods for configuration handling. This enables easier on-the fly reconfiguration of the feature sources. Further, it simplifies adding config support to feature sources in the future. Stub methods are added to sources that do not currently have any configurability. The patch fixes some (corner) cases with the overrides (--options) handling, too: - Overrides were not applied if config file was missing or its parsing failed - Overrides for a certain source did not have effect if an empty config for the source was specified in the config file. This was caused by the first pass of parsing (config file) setting a nil pointer to the source-specific config, effectively detaching it from the main config. The second pass would then create a new instance of the source specific config, but, this was not visible in the feature source, of course.
218 lines
5 KiB
Go
218 lines
5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kernel
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import (
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"bytes"
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"compress/gzip"
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"io/ioutil"
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"log"
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"os"
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"regexp"
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"strings"
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"k8s.io/apimachinery/pkg/util/validation"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Configuration file options
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type Config struct {
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KconfigFile string
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ConfigOpts []string `json:"configOpts,omitempty"`
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}
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// newDefaultConfig returns a new config with pre-populated defaults
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func newDefaultConfig() *Config {
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return &Config{
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KconfigFile: "",
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ConfigOpts: []string{
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"NO_HZ",
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"NO_HZ_IDLE",
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"NO_HZ_FULL",
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"PREEMPT",
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},
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}
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}
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// Implement FeatureSource interface
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type Source struct {
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config *Config
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}
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func (s *Source) Name() string { return "kernel" }
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// NewConfig method of the FeatureSource interface
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func (s *Source) NewConfig() source.Config { return newDefaultConfig() }
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// GetConfig method of the FeatureSource interface
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func (s *Source) GetConfig() source.Config { return s.config }
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// SetConfig method of the FeatureSource interface
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func (s *Source) SetConfig(conf source.Config) {
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switch v := conf.(type) {
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case *Config:
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s.config = v
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default:
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log.Printf("PANIC: invalid config type: %T", conf)
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}
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}
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func (s *Source) Discover() (source.Features, error) {
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features := source.Features{}
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// Read kernel version
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version, err := parseVersion()
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if err != nil {
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log.Printf("ERROR: Failed to get kernel version: %s", err)
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} else {
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for key := range version {
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features["version."+key] = version[key]
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}
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}
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// Read kconfig
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kconfig, err := s.parseKconfig()
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if err != nil {
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log.Printf("ERROR: Failed to read kconfig: %s", err)
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}
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// Check flags
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for _, opt := range s.config.ConfigOpts {
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if val, ok := kconfig[opt]; ok {
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features["config."+opt] = val
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}
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}
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selinux, err := SelinuxEnabled()
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if err != nil {
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log.Print(err)
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} else if selinux {
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features["selinux.enabled"] = true
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}
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return features, nil
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}
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// Read and parse kernel version
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func parseVersion() (map[string]string, error) {
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version := map[string]string{}
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// Open file for reading
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raw, err := ioutil.ReadFile("/proc/sys/kernel/osrelease")
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if err != nil {
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return nil, err
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}
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full := strings.TrimSpace(string(raw))
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// Replace forbidden symbols
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fullRegex := regexp.MustCompile("[^-A-Za-z0-9_.]")
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full = fullRegex.ReplaceAllString(full, "_")
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version["full"] = full
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// Regexp for parsing version components
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re := regexp.MustCompile(`^(?P<major>\d+)(\.(?P<minor>\d+))?(\.(?P<revision>\d+))?(-.*)?$`)
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if m := re.FindStringSubmatch(full); m != nil {
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for i, name := range re.SubexpNames() {
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if i != 0 && name != "" {
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version[name] = m[i]
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}
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}
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}
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return version, nil
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}
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// Read gzipped kernel config
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func readKconfigGzip(filename string) ([]byte, error) {
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// Open file for reading
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f, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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// Uncompress data
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r, err := gzip.NewReader(f)
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if err != nil {
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return nil, err
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}
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defer r.Close()
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return ioutil.ReadAll(r)
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}
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// Read kconfig into a map
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func (s *Source) parseKconfig() (map[string]string, error) {
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kconfig := map[string]string{}
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raw := []byte(nil)
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var err error
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// First, try kconfig specified in the config file
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if len(s.config.KconfigFile) > 0 {
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raw, err = ioutil.ReadFile(s.config.KconfigFile)
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if err != nil {
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log.Printf("ERROR: Failed to read kernel config from %s: %s", s.config.KconfigFile, err)
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}
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}
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// Then, try to read from /proc
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if raw == nil {
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raw, err = readKconfigGzip("/proc/config.gz")
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if err != nil {
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log.Printf("Failed to read /proc/config.gz: %s", err)
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}
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}
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// Last, try to read from /boot/
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if raw == nil {
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// Get kernel version
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unameRaw, err := ioutil.ReadFile("/proc/sys/kernel/osrelease")
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uname := strings.TrimSpace(string(unameRaw))
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if err != nil {
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return nil, err
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}
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// Read kconfig
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raw, err = ioutil.ReadFile(source.BootDir.Path("config-" + uname))
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if err != nil {
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return nil, err
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}
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}
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// Regexp for matching kconfig flags
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re := regexp.MustCompile(`^CONFIG_(?P<flag>\w+)=(?P<value>.+)`)
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// Process data, line-by-line
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lines := bytes.Split(raw, []byte("\n"))
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for _, line := range lines {
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if m := re.FindStringSubmatch(string(line)); m != nil {
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if m[2] == "y" || m[2] == "m" {
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kconfig[m[1]] = "true"
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} else {
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value := strings.Trim(m[2], `"`)
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if len(value) > validation.LabelValueMaxLength {
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log.Printf("WARNING: ignoring kconfig option '%s': value exceeds max length of %d characters", m[1], validation.LabelValueMaxLength)
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continue
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}
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kconfig[m[1]] = value
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}
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}
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}
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return kconfig, nil
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}
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